Swiss white gold and diamond-set lever watch Circa 1971

White gold and diamond-set open-faced keyless lever watch
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A Swiss white gold and diamond-set open-faced keyless lever watch, circa 1971, cal. 175 manual winding nickel lever movement, 18 jewels, mono-metallic balance.
Silvered dial, applied baton indexes and XII, 18k white gold case, inner bezel set with diamonds, case, dial and movement signed, with an unsigned 18k white gold chain.
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Diameter: 42 mm
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Signed: Patek Philippe Genève